To my knowledge, there is no complete design for legs yet, Bartods appear to be the furthest along so far.https://www.thingiverse.com/thing:2316843
But is still under development.
Once he has completed the mechanical components, the programming will start and will also be a big challenge.
I know that others are also building his designs and will also help with the software side of it.
I hope he is successful as I think most InMoov builder will be happy when he succeeds, I’m being optimistic here but with enough support I believe he has a very good chance.